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authorJoy Zou <joy.zou@nxp.com>2021-10-26 12:00:25 +0300
committerVinod Koul <vkoul@kernel.org>2021-10-28 20:26:24 +0300
commite0674853943287669a82d1ffe09a700944615978 (patch)
tree030225807cafa7f415ecb6c777678f00962d0218
parenta3e340c1574b6679f5b333221284d0959095da52 (diff)
downloadlinux-e0674853943287669a82d1ffe09a700944615978.tar.xz
dmaengine: fsl-edma: support edma memcpy
Add memcpy in edma. The edma has the capability to transfer data by software trigger so that it could be used for memory copy. Enable MEMCPY for edma driver and it could be test directly by dmatest. Signed-off-by: Joy Zou <joy.zou@nxp.com> Link: https://lore.kernel.org/r/20211026090025.2777292-1-joy.zou@nxp.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
-rw-r--r--drivers/dma/fsl-edma-common.c31
-rw-r--r--drivers/dma/fsl-edma-common.h4
-rw-r--r--drivers/dma/fsl-edma.c7
3 files changed, 42 insertions, 0 deletions
diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 009c75ff1320..3ae05d1446a5 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -348,6 +348,7 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
struct fsl_edma_engine *edma = fsl_chan->edma;
struct edma_regs *regs = &fsl_chan->edma->regs;
u32 ch = fsl_chan->vchan.chan.chan_id;
+ u16 csr = 0;
/*
* TCD parameters are stored in struct fsl_edma_hw_tcd in little
@@ -373,6 +374,12 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
edma_writel(edma, (s32)tcd->dlast_sga,
&regs->tcd[ch].dlast_sga);
+ if (fsl_chan->is_sw) {
+ csr = le16_to_cpu(tcd->csr);
+ csr |= EDMA_TCD_CSR_START;
+ tcd->csr = cpu_to_le16(csr);
+ }
+
edma_writew(edma, (s16)tcd->csr, &regs->tcd[ch].csr);
}
@@ -587,6 +594,29 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
}
EXPORT_SYMBOL_GPL(fsl_edma_prep_slave_sg);
+struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan,
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
+{
+ struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+ struct fsl_edma_desc *fsl_desc;
+
+ fsl_desc = fsl_edma_alloc_desc(fsl_chan, 1);
+ if (!fsl_desc)
+ return NULL;
+ fsl_desc->iscyclic = false;
+
+ fsl_chan->is_sw = true;
+
+ /* To match with copy_align and max_seg_size so 1 tcd is enough */
+ fsl_edma_fill_tcd(fsl_desc->tcd[0].vtcd, dma_src, dma_dst,
+ EDMA_TCD_ATTR_SSIZE_32BYTE | EDMA_TCD_ATTR_DSIZE_32BYTE,
+ 32, len, 0, 1, 1, 32, 0, true, true, false);
+
+ return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
+}
+EXPORT_SYMBOL_GPL(fsl_edma_prep_memcpy);
+
void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
{
struct virt_dma_desc *vdesc;
@@ -654,6 +684,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan)
vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
dma_pool_destroy(fsl_chan->tcd_pool);
fsl_chan->tcd_pool = NULL;
+ fsl_chan->is_sw = false;
}
EXPORT_SYMBOL_GPL(fsl_edma_free_chan_resources);
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index ec1169741de1..004ec4a6bc86 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -121,6 +121,7 @@ struct fsl_edma_chan {
struct fsl_edma_desc *edesc;
struct dma_slave_config cfg;
u32 attr;
+ bool is_sw;
struct dma_pool *tcd_pool;
dma_addr_t dma_dev_addr;
u32 dma_dev_size;
@@ -240,6 +241,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags, void *context);
+struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(
+ struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, unsigned long flags);
void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
void fsl_edma_issue_pending(struct dma_chan *chan);
int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 90bb72af306c..76cbf54aec58 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -17,6 +17,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.h>
+#include <linux/dma-mapping.h>
#include "fsl-edma-common.h"
@@ -372,6 +373,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
+ dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask);
fsl_edma->dma_dev.dev = &pdev->dev;
fsl_edma->dma_dev.device_alloc_chan_resources
@@ -381,6 +383,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic;
+ fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy;
fsl_edma->dma_dev.device_config = fsl_edma_slave_config;
fsl_edma->dma_dev.device_pause = fsl_edma_pause;
fsl_edma->dma_dev.device_resume = fsl_edma_resume;
@@ -392,6 +395,10 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ fsl_edma->dma_dev.copy_align = DMAENGINE_ALIGN_32_BYTES;
+ /* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
+ dma_set_max_seg_size(fsl_edma->dma_dev.dev, 0x3fff);
+
platform_set_drvdata(pdev, fsl_edma);
ret = dma_async_device_register(&fsl_edma->dma_dev);